A design of differential frequency hopping pattern

Differential frequency hopping (DFH) is a new frequency hopping (FH) technique, whose FH pattern is not constructed by PN sequence, but a directed graph. In a DFH system, the data is encoded by DFH technology. It needs no modulation in a DFH system. After a brief introduce of DFH, the paper gives a method of designing the DFH pattern, which has a strong mathematical basis.